MFC 206082,206179,207056,207057,210612,210636,210656,212423,212426,228121,

MFC 206082,206179,207056,207057,210612,210636,210656,212423,212426,228121,
228124,228137,228140,228141,228147,228153,228158,228311,241395,241396:
Convert WITH_CTF into a normal build option where MK_CTF is set to yes/no
depending on WITH_CTF/WITHOUT_CTF.  In addition, WITH_CTF can now be
specified in src.conf (not recommended, there are some problems with
static executables), make.conf (would also affect ports which do not use
GNU make and do not override the compile targets) or in the kernel config
(via "makeoptions WITH_CTF=yes").

Eyeballed by:	netchild, fjoe

git-svn-id: svn://svn.freebsd.org/base/stable/8@241728 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f